[BLDG-SIM] Using -999 in Min OA Schedule in eQuest

[Mike Tillou]

Kendra,
 
I am not sure how you've got your systems setup but you shouldn't need
to use the Min OA Schedule to force the OA to 100% in the summer.  I
have found that the best way to simulate Dir/Ind systems is to use the
keyowrds on the Pre-Conditioner tab under your HVAC system as opposed to
using the DIR/IND System Type (check the DOE 2.2 documentation for the
differences).  One of the keywords is EVAP-CLR-AIR which describes the %
of supply air that will pass through the DIR/IND.  Set this to 1.0, then
set the keyword DRYBULB-LIMIT to some high value like 130 (default is
120).  Anytime the outside air temp is below DRYBULB-LIMIT and above
your SAT the DIR/IND will use 100% OA.
 
The nice thing about using the DIR/IND on the pre-conditioner tab versus
the DIR/IND system type is you can set up all the keyword variables and
then turn it on and off using a parametric run.  
 
Mike

Michael Tillou, PE
etc Group, Inc.
PO Box 7, Williamstown, MA 01267
ph. (413) 458-9870 fx. (413) 458-9875


	-----Original Message-----
	From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of
Tupper, Kendra
	Sent: Thursday, August 17, 2006 7:24 PM
	To: BLDG-SIM at GARD.COM
	Subject: [BLDG-SIM] Using -999 in Min OA Schedule in eQuest
	
	

	I am trying to simulate the following system:

	A DX cooler with VAV (HW reheat) that uses 100% outside air and
an indirect/direct evap cooler in the cooling months (the climate is Las
Vegas - very hot and dry).  In the winter, the outside air should be at
a minimum as determine by the OA/person specified at the zonal level.

	I created a Minimum OA Schedule and set the fraction to 1.0 for
the cooling months.  In the help menu, and in the DOE2.2 documentation,
it says to set the schedule value to -999 when you want the fraction to
revert to the minimum calculated OA.  When I tried to enter -999, I get
an error saying that negative values are not accepted.  I tried changing
this in the input file, but when I open the file in eQuest, I receive
errors as well.

	Does anyone know how to get eQuest to accept the -999 value in
the minimum OA schedule?

	Thank you!

	Kendra

	Kendra Tupper

	LEED(r) AP                

	 FLACK + KURTZ  

	405 Howard Street               415.398.3833 Main

	Suite 500                       415.402.5840 Direct

	San Francisco, CA 94105         415.433.5311 Fax

	http://www.flackandkurtz.com    kendra.tupper at sf.fk.com
<mailto:kendra.tupper at sf.fk.com> 

	


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